Tungsten boats used for evaporation are usually produced using powder metallurgy processes. The following are the general steps for producing a tungsten boat for evaporation:

Raw material selection: Select high-purity metal tungsten powder, usually with a purity of 99.95%, as the main raw material for the production of tungsten boats. High purity ensures minimal contamination during evaporation. Mixing: Carefully mix tungsten powder using specialized equipment to achieve a homogeneous mixture and consistent material properties. Compaction: Mixed tungsten powder is placed into a mold and high pressure is applied, typically via cold isostatic pressing (CIP) or uniaxial pressing. The process compacts the powder into a dense and coherent shape that resembles the desired boat geometry. Pre-sintering: Compacted tungsten parts are pre-sintered at high temperatures in a controlled atmosphere, allowing the powder particles to bond and form a solid structure of increased strength. Sintering: The pre-sintered parts are then subjected to a high-temperature sintering process in a vacuum or hydrogen atmosphere. This process further densifies the material, removes residual pores, and promotes grain growth, resulting in a strong and dense tungsten boat. Machining and finishing: After sintering, the tungsten boat can undergo machining operations such as milling, turning or grinding to achieve the final dimensions, grooves and surface finish required for efficient evaporation of the material during the evaporation process. Quality Control: Finished tungsten boats are inspected for dimensional accuracy, surface integrity and material purity to ensure they meet specified requirements for evaporation applications.

Throughout the production process, strict quality control measures and process monitoring are crucial to ensure that the tungsten boat meets the stringent requirements of the vacuum deposition process. The resulting tungsten boat is able to withstand high temperatures and corrosive environments, making it suitable for a variety of vacuum evaporation applications across industries.